pdgLive Home   >   Baryon Summary Table   >   ${{\mathit \Sigma}{(1620)}}$

${{\mathit \Sigma}}$ BARYONS ($\mathit S$ = $-1$, $\mathit I$ = 1) ${{\mathit \Sigma}^{+}}$ = ${\mathit {\mathit u}}$ ${\mathit {\mathit u}}$ ${\mathit {\mathit s}}$, ${{\mathit \Sigma}^{0}}$ = ${\mathit {\mathit u}}$ ${\mathit {\mathit d}}$ ${\mathit {\mathit s}}$, ${{\mathit \Sigma}^{-}}$ = ${\mathit {\mathit d}}$ ${\mathit {\mathit d}}$ ${\mathit {\mathit s}}$

INSPIRE   JSON PDGID: B032

${{\mathit \Sigma}{(1620)}}$ $I(J^P)$ = $1(1/2^{-})$

The ${\mathit S}_{\mathrm 11}$ state at 1697 MeV reported by VANHORN 1975 is tentatively listed under the ${{\mathit \Sigma}{(1750)}}$. CARROLL 1976 sees two bumps in the isospin-$1{}^{}{}^{}$ total cross section near this mass. GAO 2012 sees no evidence for this resonance. Production experiments are listed separately in the next entry.

Expand/Collapse All

▸  exp ${{\mathit \Sigma}{(1620)}}$ POLE POSITION

REAL PART $1680$ $\pm8$ MeV

$-2{\times }$IMAGINARY PART $39$ $\pm11$ MeV

▸  exp ${{\mathit \Sigma}{(1620)}}$ POLE RESIDUE

Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Sigma}{(1620)}}$ $\rightarrow$ ${{\mathit \Sigma}}{{\mathit \pi}}$ $0.14$ $\pm0.03$

Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Sigma}{(1620)}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \pi}}$ $0.10$ $\pm0.03$

Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Sigma}{(1620)}}$ $\rightarrow$ ${{\mathit \Xi}}{{\mathit K}}$ $0.02$ $\pm0.01$

Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Sigma}{(1620)}}$ $\rightarrow$ ${{\mathit \Lambda}{(1520)}}{{\mathit \pi}}$ $0.12$ $\pm0.05$

Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Sigma}{(1620)}}$ $\rightarrow$ ${{\mathit \Sigma}{(1385)}}{{\mathit \pi}}$ $0.015$ $\pm0.010$

Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Sigma}{(1620)}}$ $\rightarrow$ ${{\mathit N}}{{\overline{\mathit K}}^{*}{(892)}}$, ${\mathit S}{\mathrm -wave}$ $0.05$ $\pm0.04$

Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Sigma}{(1620)}}$ $\rightarrow$ ${{\mathit N}}{{\overline{\mathit K}}^{*}{(892)}}$, ${\mathit D}{\mathrm -wave}$ $0.01$ $\pm0.01$

Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Sigma}{(1620)}}$ $\rightarrow$ ${{\mathit N}}{{\overline{\mathit K}}}$ $0.11$ $\pm0.03$

${{\mathit \Sigma}{(1620)}}$ MASS 1600 TO 1650 $(\approx 1620 )$ MeV

${{\mathit \Sigma}{(1620)}}$ WIDTH 40 TO 100 $(\approx 70 )$ MeV

${{\mathit \Sigma}{(1620)}}$ DECAY MODES

Mode   Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/ Conf. Level P(MeV/c)   $\Gamma_{1}$ ${{\mathit N}}{{\overline{\mathit K}}}$ 0.10 to 0.60 364   $\Gamma_{2}$ ${{\mathit \Lambda}}{{\mathit \pi}}$ ($9.0$ $\pm3.0$ ) $\%$ 410   $\Gamma_{3}$ ${{\mathit \Sigma}}{{\mathit \pi}}$ ($17$ $\pm5$ ) $\%$ 354   $\Gamma_{4}$ ${{\mathit \Xi}}{{\mathit K}}$ -1   $\Gamma_{5}$ ${{\mathit \Lambda}{(1520)}}{{\mathit \pi}}$ ($10$ $\pm5$ ) $\%$ -1   $\Gamma_{6}$ ${{\mathit \Sigma}{(1385)}}{{\mathit \pi}}$ 181